1115801280 has 168 divisors, whose sum is σ = 4186909584. Its totient is φ = 270489600.

The previous prime is 1115801279. The next prime is 1115801311. The reversal of 1115801280 is 821085111.

1115801280 is a `hidden beast` number, since 1 + 1 + 1 + 580 + 1 + 2 + 80 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14070 + ... + 49290.

Almost surely, 2^1115801280 is an apocalyptic number.

1115801280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1115801280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2093454792).

1115801280 is an abundant number, since it is smaller than the sum of its proper divisors (3071108304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1115801280 is a wasteful number, since it uses less digits than its factorization.

1115801280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35255 (or 35242 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 1115801280 is about 33403.6117807641. The cubic root of 1115801280 is about 1037.1994674119.

Adding to 1115801280 its reverse (821085111), we get a palindrome (1936886391).

The spelling of 1115801280 in words is "one billion, one hundred fifteen million, eight hundred one thousand, two hundred eighty".